Honestly, I happlily played several adventures using Advanced Fighting Fantasy Quickstart Guide (a simple d6 ruleset freely available on Drivethrough RPG) plus Life on Barsoom setting adaptation (http://fightingfantasy.wikia.com/wiki/Life_on_Barsoom) and they worked well with Barsoom without spending a cent.
As a game master, however, you need to buy the ruleset.

finarvyn wrote:Agreed that 5E interests me a lot more than 2d20. I really am surprised that WotC or someone hasn't come up with 5E Space, 5E Modern, and so on. Then we could tweak it to have our 5E Barsoom.

I'll probably back the kickstart just becasue it's John Carter of Mars, but I'd like a 5E version a lot better.

finarvyn wrote:Agreed that 5E interests me a lot more than 2d20. I really am surprised that WotC or someone hasn't come up with 5E Space, 5E Modern, and so on. Then we could tweak it to have our 5E Barsoom.

I'll probably back the kickstart just becasue it's John Carter of Mars, but I'd like a 5E version a lot better.

Just read and made a few PCs. If I wanted to play I’d end up DM and I just don’t have time. I run two campaigns of 5e already. I did write a review though (unpublished). More of campaign hand out really.Wait a bit I’ll make a link...https://www.dropbox.com/s/5k74q62ujqip4 ... .docx?dl=0